entity edit forms redesign

progress of issue #64 
It's nearly done.
Redesigned tabs and input fields in entity edit form (90% done)
Allow to set multiple entity Categories (90%) ;  to do - addign request to queue for approval

update process:
backup db and content
git pull
go to application and run
 ./doctrine orm:schema-tool:update --force
regenerate proxies for models
./orm:generate-proxies
ensure that apache owns files in application/models/models/Proxies/
restart apache
login as to the web as user with admin permissions
go to Menu->General->system and run all buttons